Piston type vacuum pumps and compressors are being used where oil-free air is a must. The oil free character of the pump is usually a guaranty of zero-maintenance costs. The pumps can be found in capacities of maximum 
6 m3/hr and they are capable to reach a vacuum of 10 mbar(a). Used because a compressor they reach a pressure of approx. 7 bar(g) maximum.
These pumps are Piston Vacuum Pump getting used for light industrial functions, medical industry, printing and instrument industry, plastic, food and packaging, electronic, chemical and textile industry.